Electrochemical carbon dioxide capture to close the carbon cycle

Electrochemical CO 2 capture technologies are gaining attention due to their flexibility, their ability to address decentralized emissions ( e.g. , ocean and atmosphere) and their fit in an electrified industry. In the present work, recent progress made in electrochemical CO 2 capture is reviewed. T...

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Bibliographic Details
Published in:Energy & environmental science 2021-01, Vol.14 (2), p.781-814
Main Authors: Sharifian, R, Wagterveld, R. M, Digdaya, I. A, Xiang, C, Vermaas, D. A
Format: Article
Language:English
Subjects:
Carbon cycle
Carbon dioxide
Carbon sequestration
Dehydration
Deionization
Electrochemistry
Electrodialysis
Electrolysis
Energy conversion efficiency
Energy efficiency
Membranes
pH effects
Redox reactions
Working fluids
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Summary:Electrochemical CO 2 capture technologies are gaining attention due to their flexibility, their ability to address decentralized emissions ( e.g. , ocean and atmosphere) and their fit in an electrified industry. In the present work, recent progress made in electrochemical CO 2 capture is reviewed. The majority of these methods rely on the concept of "pH-swing" and the effect it has on the CO 2 hydration/dehydration equilibrium. Through a pH-swing, CO 2 can be captured and recovered by shifting the pH of a working fluid between acidic and basic pH. Such swing can be applied electrochemically through electrolysis, bipolar membrane electrodialysis, reversible redox reactions and capacitive deionization. In this review, we summarize main parameters governing these electrochemical pH-swing processes and put the concept in the framework of available worldwide capture technologies. We analyse the energy efficiency and consumption of such systems, and provide recommendations for further improvements. Although electrochemical CO 2 capture technologies are rather costly compared to the amine based capture, they can be particularly interesting if more affordable renewable electricity and materials ( e.g. , electrode and membranes) become widely available. Furthermore, electrochemical methods have the ability to (directly) convert the captured CO 2 to value added chemicals and fuels, and hence prepare for a fully electrified circular carbon economy. An overview of the state-of-the-art for capturing CO 2 via electrochemical routes.
ISSN:1754-5692
1754-5706
DOI:10.1039/d0ee03382k